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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Parenthetical) (Detail) - Foreign Exchange Contracts [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Call Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | $ 248.8 | $ 276.4
Put Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | 248.8 | 276.4
Forward Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | 26.9 | 23.1
Forward Contracts [Member] | Call Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | $ 68.1 | $ 72.9

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- Definition Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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